Roadmap

Math, Pumps, Activated Sludge, Disinfection, and more — each with detailed explanations for every answer choice, including why wrong answers are wrong.

Answer positions shuffle every time so you learn the concepts, not just memorize the letter.

One-tap login with your Google account so you can get to studying faster.

14 in-depth articles covering the math formulas, process knowledge, and exam strategies you need to pass.

Dedicated pages for Texas, Florida, Pennsylvania, Georgia, and New York with your state's requirements, fees, and links to apply.

One-time purchase for full access — no subscriptions, no recurring charges. Pay once, study forever.

Preview real exam-style questions before signing up — so you know exactly what you're getting.

Touch-friendly answers, readable text, and a layout built for studying on your phone.

Expanding across all major exam topics — Math, Pumps, Activated Sludge, Trickling Filters, Disinfection, Safety, Lab, and more. Every question includes detailed explanations.

Sign in with your Apple ID — coming soon for iPhone and iPad users.

Visual math steps, collapsible explanations, and clear breakdowns of why each wrong answer is wrong.

Expanding beyond Class A to cover all treatment plant operator grades.

Practice questions for Collection System certification.

See your strengths and weaknesses by topic — know exactly where to focus.

Build a consistent study habit with streak tracking and reminders.

Add SludgeSchool to your home screen for one-tap access, even offline.

Send a set of questions to a colleague and compare scores. "I got 8/10 on Activated Sludge — can you beat me?"

Flag confusing questions or bad explanations so we can fix them fast.